| Board of Directors | 1977 – 1989 |
| Board of Directors | 1977 – 1993 |
| Chairman | 2013 – 2014 |
| Board of Directors | 1997 – 2016 |
| Chairman | 2009 – 2011 |
| Board of Directors | 1977 – 1997 |
| Chairman | 2011 – 2013 |
| Board of Directors | 2002 – 2000 |
| Board of Directors | 2013 – 2014 |
| Board of Directors | 2003 – 2011 |
| Deputy Chairman | 1977 – 1989 |
| Board of Directors | 2011 – 2013 |
| Board of Directors | 2014 – 2016 |
| Board of Directors | 1977 – 1994 |
| Chairman | 2014 – 2016 |
| Chairman | 1977 – 1989 |
| Chairman | 1977 – 2009 |
| Board of Directors | 2011 – 2011 |
| Board of Directors | 1977 – 2002 |
